The US Food and Drug Administration's Center for Biologics Evaluation and Research (CBER) is again extending an invitation to biologics facilities for participation in its Regulatory Site Visit Training Program (RSVP). The program, initiated in 2005, aims to give CBER's regulatory review, compliance, and other relevant staff an opportunity to visit biologics facilities and allow CBER staff to directly observe routine manufacturing practices. The objective is to give its staff a better understanding of the biologics industry, including its challenges and operations, and improve communication with CBER staff and industry.